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Drama-free vent: I miss when 1U meant something

Datacenter Talk by MARIA3 21 replies 2.8K views
marcus_qc

Member

#11

FlowSana said:
Floor loading for a standard 42U rack at 2.5kW per 1U would exceed 100kW
Nobody actually fills 42U with these though right? I mean you'd melt. We leave 1U gap between every node and still the hot aisle is brutal.

42U and still growing
MARIA3

Member OP

9 #12

marcus_qc said:
Nobody actually fills 42U with these though right?
My old boss tried. 28U of compute, rest for switching. We had to shut down in summer because HVAC could not keep up. Now I have rules.

siesta first, deploy later
LichunLars

Member

#13

In Stockholm we have free cooling half the year but the other half, running 40kW+ per rack is just burning money. I moved inference workloads to Hetzner Cloud GPU instances for winter. Their Falkenstein plant is well built.

1ms or I don't want it
KE

Member

#14

LichunLars said:
Hetzner Cloud GPU instances
How's the scheduling there? Last I checked their GPU instances had wait times measured in days, not minutes.

LichunLars

Member

#15

keysales said:
Wait times measured in days
For the H100s yes. A100 and L40S usually available same day. I use L40S for smaller models, it's fine.

1ms or I don't want it
kat_fold

Moderator

Moderator

#16

Can we pull this back to the form factor question? I just want to know who here is actually getting 2.5kW 1U boxes into colo. My provider in Lisbon caps at 8kW per rack and charges eye-watering rates above that.

~be kind or be gone~
Doug

Member

New Jersey

9 #17

kat_fold said:
Caps at 8kW per rack
That's generous. My last Jersey colo was 5kW standard, anything over was custom quote and they acted like I asked for their firstborn.

grabs popcorn, checks /r/drama
danfra

Member

#18

Frankfurt is different. Most facilities here built for finance HFT, so 15-20kW per rack is table stakes. But you pay for it. Interxion FRA1, Equinix FR5, both handle high density fine.

mitigated 800Gbps before breakfast
TE

Member

#19

danfra said:
15-20kW per rack is table stakes
Per rack or per square meter? Because those are very different numbers and I've seen both quoted.

danfra

Member

#20

Tech47 said:
Per rack or per square meter?
Per rack, committed. Square meter pricing is for cage space, not power commitment. I always negotiate on kW, not floor tiles.

mitigated 800Gbps before breakfast

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